Measuring-pump



(No Model.)

N. B. A-GHESON. MEASURING PUMP.

Patented Aug. 23

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NITED STATES PATENT OFFICE,

NATHAN B. AOHESON, ()F YOUNGSTOWN, OHIO.

MEASURING-PUMP.

SPECIFICATION forming part of Letters Patent No. 246,058, dated August23, 1881.

Application filed March 14, 1881.

To all whom it may concern:

Be it known that I, NATHAN B. AOHESON, a citizen of the United States,residing at Youngstown, in the county of Mahoning and State of Ohio,have invented certain new and useful Improvements in Measuring-Pumps;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to letters or figures of referencemarked thereon, which form apart of this specific'ation.

The present invention relates to that class of pumps for measuringliquids in which a piston operates in a chamber or cylinderof knowncubical capacity.

The chief object of the invention is to provide means whereby thedischarge of theliquid from the measuring cylinder or chamber cannot beeffected it the stroke of the piston is reversed either in ascending ordescending before said stroke is completed-that is, before the pistonreaches the top or bottom of the cylinder, as the case may be.

The invention consists in the construction and combination of parts,which will hereinafter be more fully described, and then set forth inthe claims.

In the drawings, Figure 1 is a vertical sectional view of ameasuringpump constructed according to my invention. Fig. 2 is a sideelevation thereof, and Fig. 3 is an enlarged view of valve-lockingdevice.

The measuring-chamber or liquid-receiver is composed of a cylindricalshell, A, having an attachable top head, 13. The cylinder is generallymade of metal, and is, with the bottom 0, cast in one piece. The head issecured to the cylinder by bolts I), which pass through ears on thesides of the head and lugs projecting from the cylinder, as shown in thedrawings; or it may be attached in any other well-known way. Apacking-gasket is interposed between the end of the cylinder and thehead to make a liquid-tight joint. A piston, D, is attached to apiston-rod, E, which passes through thetop head or cap-plate, B, and isconnected with a lever, F, fulcrumed in a bracket,

(No model.)

G, of said capplate. The piston-rod works through a stuffin gbo x orpackin g-cap, H, which fits on a screw-threaded neck, I), of the cap ortop head. A cross-head, E, or enlargement of the upper end of thepiston-rod, slides between guide arms or plates I, formed integral withthe cup-plate or top head, B. The edges of the cross-head are generallygrooved for the reception of the guide arms or plates. The bottom 0 isgenerally made of aflaring shape, and has a suitable neck for theattachment of the inlet-tube J, which leads into the barrel or otherIiquidreservoir. A check-valve, K, mov able in an upward direction,prevents reflux of the liquid through theinlet-tube. The piston has acentral opening, M, which is closed by means of a valve, N, when thepiston is in proper position for expelling the liquid from themeasuringchamber or cylinder. The valve N is also provided with a spring, 0,which holds it down upon its seat, the force of said spring, however,being easily overcome by the pressure of the liquid upon the bottom ofthe valve when the piston is descending and is not looked, ashereinafter explained.

Attached to the piston, and journaled in a suitable support or yoke onthe top of the piston, there is a vertical rock-shaft or arm, P, whichextends through the piston. The upper end of this rock-shaft has ahorizontal extension, 1 which, when the piston has reached the limit ofits upward stroke, comes in contact or engages with an inclined plane orprojection, Q, on the cap-plate of the cylinder. This partly rotates therock-shaft and causes a projection, P on said rock-shaft to bear againstthe under side of the piston-valve, or project under it and hold it openwhile the piston is making its downward stroke. As soon as the pistonhas reached the bottom of the cylinder the rock-shaft is again turned,so as to disengage the projection or holding-arm P and permit the valveto close. This second movement of the rock-shaft is effected by aninclined plane or projection, R, on the lower head of the cylinder andhorizontal extension P on the lower end of the rock-shaft. The valve isthen held in a closed position by means of a holding arm or projection,P, which, when the rocking-shaft is turned by the projection on thebottom head, bears upon the top surface of the valve. The valve being ina closed position, the movement of the piston in an upward directionwill cause the expulsion of the liquid through the spout or outlet-tubeS at the upper end of the cylinder. In order to permit theprecisequantity ofliquid discharged to be readily known, I provide one of theguideplates of the piston cross-head with a graduated scale, T, by meansof which and a suitable pointer on the cross-head the quantitydischarged is easily read.

The object of the aforesaid valve-operatin g device is to hold the valveopen and shut, respectively, during the downward and upward strokes, inorder th at full measure shall always be given. An upward stroke cannotbe made until the piston has first touched the bottom, for, the valvebeinglocked open, as above described, if the stroke is reversed beforeit touches the bottom, the valve will still be held open, and thecontents of the pump above the piston will pass through the valve andwill not be discharged. On the other hand, ifit is attempted to reversean upward stroke before the piston has reached the top of the cylinder,the valve will still be locked down, and a downward strokecannot'consequently be made.

A measuring-pump constructed according to my invention will enable theseller to readily perceive when he gives full measure, and fraud on. thecustomer is also effectually prevented, because the discharge of theliquid cannot take place until the piston has reached the limit of itsupward and downward strokes, when the valve is opened and closed in themanner already described.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a measuring-pump, the combination of a measuring-cylinder having atop outlet, a piston moving in said cylinder provided with a valve, andmeans substantially as described, for holding said valve open andclosed, respectively, during the downward and upward strokes, as and forthe purpose set forth.

2. The combination of the vertical rockshaft, having projectionsextending at right angles therefrom, with the piston, having a valve,and the measuring-cylinder, having end heads provided with projectionsor inclined stops, as and for the purpose set forth.

3. The cap-plate or upper head, constructed with guide plates or armsand a lever-bracket, in combination with the piston-rod having across-head, the measuring-cylinder, and the operating-lever, as and forthe purpose set forth.

4. The graduated-scaleplate, in combination with the cylinder, the capthereof, and the piston-rod provided with a suitable pointer, as and forthe purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

NATHAN B. AUHESON.

Vitnesses:

D. N. SIMPKINS, J AMES KENNEDY.

